气候变化领域集成服务门户(CCPortal): Persistent organic matter in oxic subseafloor sediment

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DOI	10.1038/s41561-018-0291-5
	Persistent organic matter in oxic subseafloor sediment
	Estes E.R.; Pockalny R.; D’Hondt S.; Inagaki F.; Morono Y.; Murray R.W.; Nordlund D.; Spivack A.J.; Wankel S.D.; Xiao N.; Hansel C.M.
发表日期	2019
ISSN	17520894
卷号	12 期号:2
英文摘要	Nearly half of the global seafloor is overlain by sediment oxygenated to the basement. Yet, despite the availability of oxygen to fuel aerobic respiration, organic carbon persists over million-year timescales. Identifying the controls on organic carbon preservation requires an improved understanding of the composition and distribution of organic carbon within deep oligotrophic marine sediments. Here we show that organic carbon in sediment from the oligotrophic North Atlantic and South Pacific is low (<0.1%), yet stable to depths of 25 m and ages of 24 million years. This organic carbon is not bound in biomass and has a low carbon/nitrogen ratio. X-ray imaging and spectroscopic analyses reveal that the chemical composition of this old, deep organic carbon is dominated (40–60%) by amide and carboxylic carbon with a proteinaceous nature. We posit that organic carbon persists in oxic oligotrophic sediment through a combination of protective processes that involve adsorption to mineral surfaces and physical inaccessibility to the heterotrophic community. We estimate that up to 1.6 × 1022 g of organic carbon are sequestered on million-year timescales in oxic pelagic sediment, which exceeds current estimates of the total global sediment organic carbon and constitutes an important, previously overlooked carbon reservoir. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	adsorption; chemical composition; oligotrophic environment; organic carbon; oxic sediment; oxygenation; pelagic deposit; persistent organic pollutant; seafloor; sediment chemistry; Atlantic Ocean; Atlantic Ocean (North); Pacific Ocean; Pacific Ocean (South)
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124720
作者单位	Department of Marine Chemistry and Geochemistry, MIT-WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, United States; Kochi Institute for Core Sample Research, Japan Agency for Marine−Earth Science and Technology (JAMSTEC), 200 Monobe Otsu, Nankoku City, Japan; Department of Earth and Environment, Boston University, Boston, MA, United States; Stanford Synchrotron Radiation Lightsource, Menlo Park, CA, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; College of Earth, Ocean, and Environment, University of Delaware, Lewes, DE, United States
推荐引用方式 GB/T 7714	Estes E.R.,Pockalny R.,D’Hondt S.,et al. Persistent organic matter in oxic subseafloor sediment[J],2019,12(2).
APA	Estes E.R..,Pockalny R..,D’Hondt S..,Inagaki F..,Morono Y..,...&Hansel C.M..(2019).Persistent organic matter in oxic subseafloor sediment.Nature Geoscience,12(2).
MLA	Estes E.R.,et al."Persistent organic matter in oxic subseafloor sediment".Nature Geoscience 12.2(2019).